bit_swap_adjacent

eve::bit_swap_adjacent = functor<bit_swap_adjacent_t>

inlineconstexpr

Header file

#include <eve/module/core.hpp>

Callable Signatures

namespace eve
{
   // Regular overload
   constexpr auto bit_swap_adjacent(unsigned_value auto x, integral_scalar_value auto n) noexcept;                          // 1
 
   // Lanes masking
   constexpr auto bit_swap_adjacent[conditional_expr auto c](unsigned_value auto x, integral_scalar_value auto n) noexcept; // 2
   constexpr auto bit_swap_adjacent[logical_value auto m](unsigned_value auto x, integral_scalar_value auto n)    noexcept; // 2
}

Parameters

• x: argument.
• n: size of the groups of bits to be swapped. n MUST be a power of 2 else the call will assert.
• c: Conditional expression masking the operation.
• m: Logical value masking the operation.

Return value

1. Return x with pairs of contiguous groups of N bits swapped in each element.
   • If n is greater or equal to sizeof(x)*8 0 is returned.
   • If n is equal to 0 x is returned.
2. The operation is performed conditionnaly.

Example

// revision 2
#include <eve/module/core.hpp>
#include <iostream>
 
int main()
{
 
  eve::wide wu0{0u, 1u, 2u, 3u, 4u, 5u, 6u, 7u};
 
  std::cout << "-> bit_swap_adjacent(wu0, 2)                  = " << eve::bit_swap_adjacent(wu0, 2) << "\n";
  std::cout << "-> bit_swap_adjacent[ignore_last(2)](wu0, 2) = " << eve::bit_swap_adjacent[eve::ignore_last(2)](wu0, 2) << "\n";
  std::cout << "-> bit_swap_adjacent[wu0 != 2u](wu0, 2)      = " << eve::bit_swap_adjacent[wu0 != 2u](wu0, 2) << "\n";
  std::cout << "-> bit_swap_adjacent(wu0, 2)                 = " << eve::bit_swap_adjacent(wu0, 2) << "\n";
}

Semantic Modifiers